Manufacture of rubber soles and analogous articles



Dec. 27, 1927. 1,654,001

J. A. HOWARD MANUFACTURE OF RUBBER SOLES AND ANALOGOUS ARTICLES Filed Dec. 30. 1926 2 Sheefs-Sheet 1 j M ff gwuemto'o k AHHO Q llllllll sen, Z fa, flitwmq! Dec. 27, 1927. 1,654,001

J. A. HOWARD MANUFACTURE OF RUBBER 'SOLES AND ANALOGOUS ARTICLES Filed Dec. so. 1926 z'sheezs-sneet 2 l M wjW/fiy/ W 5 "mml w w 35am .1 3 2 6/6/27! fl-fi'bwaz'd Patented Dec. 27, 1927.

PATENT OFFICE.

JOHN A. HQWARD, OF JOHNSON CITY, NEW YORK.

MANUFACTURE OF RUBBER SOLES AN D ANALOGOUS ARTICLES.

Application filed December 80. 1926.

The primary object of this invention is the conservation of material, the saving of time and the utilization of space in the manufacture of rubber soles and kindred articles.

In practicing the invention a mold is pro- .vided, the same consisting of two parts, one part. containing the mold space into which the rubber is forced and the other part having a channel conforming to the outline of ill) ill

the mold cavity to receive the excess of rubber as a result of the molding operation when pressure is exerted to bring the parts of the mold together to shape the article to be formed. The channel is exterior to and adjacent the mold cavity and its wall is roughened to cause the surplus rubber received therein to stick and as a result, when the moldis separated, the surplus stock is removed from the article which comes from the mold clean without necessitating any subsequent trimming.

While thedrawings illustrate a preferred embodiment of the invention, it is to be understood that in adapting the means to meet specific needs and requirements, the design may be varied and such other changes in the minor details ofconstruction may be resorted to within the scope of the invention as claimed, Withoutdeparting from the spirit thereof.

For a full understanding of the invention and the merits thereof, reference is to be had to the following description and the drawings hereto attached, in which,

Figure 1 is a perspective view of a mole embodying the invention, the parts being separated and the piece of rubber to be molded being shown therebetween.

Figure 2 is a sectional view of the mold after the parts having been brought together and preliminary to the application of pressure to force the material into the mold cavities.

Figure 3 is a view similar to Figure 2, after the parts of the mold have been subjected to pressure to force the rubber into the mold cavities.

Figure 4 is a sectional view of the mold as it appears with the parts separated after the molding operation, showing the removal of the surplus material.

Figure 5 is a fragmentary view of that part of the mold in which the channel is formed for receiving the surplus material.

Figure 6 is a fragmentary sectional view of a portion of the mold and provision for Serial No. 158,044.

supplying the material in an amount suflicient to fill the mold cavity and allowing for an overflow of the small surplus.

Figure 7 is a sectional view similar to Figure of a modification.

Corresponding and like parts are referred to in the following description and desig nated in the several views of the drawings by like reference characters.

The mold comprises parts or members designated by the numerals 1 and 2 respective ly. Thepart :2 has the mold space or cavity 3 formed therein, the same conforming to the shape of the article to be molded. In the present instance the mold cavity 3 conforms to the outline of a shoe sole, and in the event of the mold being designed to form a nunr her of articles at one operation the mold "avities 3 are disposed in reverse order, so as to economize in space. p This also results in a minimum waste of material because of the narrow space orpart separating adjacent mold cavities, as indicated most clearly in Figure 1. The shape of the mold cavity will depend'upon the outline of the article to be molded and the number of mold cavities or spaces will depend upon the capacity of the mold, and the number of articles to be formed by the mold at one operation.

The part 1 is provided with a channel'or groove l which conforms to the outline of tho mold :avity to receive the surplus material incident to the molding operation when the parts of the mold are pressed together. The channel or groove t is positioned adjacent the mold cavity and exterior thereto so as to receive the surplus material without the formation of any fin between the article when molded and the surplus amount of material pressed into the groove or channel l. The Wall of the groove or channel 4 is roughened, as indicated most clearly in Figure 5, the purpose being to cause the surplus material to adhere or stick thereto so as to be separated from the article when the parts of the mold are separated, as indicated most clearly in Figure 4, thereby obviating any subsequent trimming of the article which comes from the mold clean and free from any web or fin.

The mold illustrated in Figure 1 has the part 1 formed with a depending flange 5 t0 snugly embrace the outer sides of the part 2, thereby confining the material and insuring the accurate positioning of the parts when pressed together, so that the circumscribing; groove. on, channel twill assume a COIIGOUPQSIUOD' with reference to the mold cavity. The part 2 of the mold isfi'orlned with an outwardly directed. flange ,6 upon.

which the flange 5 rests when the two parts of the moldareapressedtogether. In the modification shown in Figure 7 the part 2 of the mold has @y'-Jlilld 8 applied; to its marginal portion and secured thereto by riv- 10 ets 9 or othersuitable fastening means. The guard 82 assures the proper positioning of the parts of hemold'when pressed together. This" guard 8' also serves ,t'oconfine the material 7 when the mold: is subjected to pres 5, ;;sure;to -bringz the parts li and 2 together to niQL'CGjjLhG -lL'll1lQ6I?.l'1ltO iil1i-3. mold cavity.

T-he n aterlial Trusually consists of apiece of sheet rubben ofla size to insure thelfil'ling of :thegnold cavity when the parts-of the moldare brought; togeth r; duel allowance eing hnd ior, sli ght surplus or. waste, WhiCh; sgrQ elYi fhlll the cl annelor groove at andbetween;the opposing laces of the mold, q as indicated most,clearly in Figures 3 jnto the channel or'groove e: provides a bead 10.-and that part: remaining; between the op posing;facesofthe mold forms a web orfin 11. i This is indicated most clearly in 0 Figures?) and 4. VVhen'themold is separated after the molding operation the surplus "material representedbypthe head 10- e and the web, or tin 11 is'detached from the e articlen oldeclgas indicated most clearly in Figure l, thisrbeing assured by the sticking of the beadlO-to the roughened wall of the groove or channel 4. The article t11usn1olded dSglt leares the cavityis clean and lrcer from projectingparts which usually require o subsequent trimming.

W h-ile it ispreferred to cut the material vfrom a sheet, it is observed that it may be ,supplied to the mold in any preferred and rdeterminate way, the amount supplied being 5 snflicient to fillth'emoldcavity and allow for and t: 4.; ,That portioniot theinaterial overflowingi av slight overflow to rinsurerthetcomp-lete fill Hing: oi? the mold cavity. u A plurality of molds .Wnreprovided and as each mold is supplied with.theuproper amount of material it is stacked, thereby admittingof a number of in-olds being;simultaneousl u subjected to hydraulic pressure and a curing oi the rubber, ;thereby enablingthe invention to be effected in an economical way and on a practical mbasis.

cHav-ing' thus :described the: invention, I

. claim 1. 1 In the-manufacture ot molded articles, a mold having a-lnolding cavityand aicircumscribing ehannehfor-reception rot surplusrmai-terial; the wall. of said channel being rough- -=ened-to cause the surplus material toadhere thereto, whereby' t-o' assnmetlie separation of the surplus inaterialrt'roin the molded; article 1 when separatingthe mold.

2. A: ;inold ;.compr-ising ycomplementary :1 3p arts,: the; nnexhaving as,:fl.an ge toiembraoex the outer sideotthe other-for confiningithe mahe part-s when broughtzxtogethcr, one'ofsaid y -parts having the molding space formed therein. 'Elllldlythtl other :partbeing provided with a circumscribing;channelxfor receiving A the surplus, material; the wall of said channel being roughened to cause thesurplusniaterial to stick theretoto insure the article coming from the mold'clean without necessitating subsequent trimming.

33A moldr comprising; complementary 'parts ponezo'i which is provided with a flange adapted-to fitthe other,,one of saidparts being :provided withs-paced moldv cavities and the other witln channels COIIfOIJDlIlQ'lO the shape of the mold cavities and having their walls roughened to receive and retain the surplus materialiduringi the molding operation.

In testimony whereof Isatfix my signature.

JOHN. A: HOWARD.

terial and assuring-Vgproper poSit-ioningxrof 

